Pocket folding rule



(No Model.

A. H. DAUOHY 8c P. ROBERTS.

POCKET FOLDING RULE.

No. 414,877. Patented Nov. 12, 1889.

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UNITED STATES PATENT OFFICE.

ARTHUR H. DAUCI-IY AND'PETER ROBERTS DF SAN DIE 10, CALIFORNIA.

POCKET FOLDING RULE.

SPECIFICATION forming part of Letters Patent No. 414,877, dated November 12, 1889.

Application filed October 27, 1888. Serial No. 289.1,35'7. (No model.)

To all w/wm it may concern.-

.Be it known that we, ARTHUR H. DAUCHY and PETER ROBERTS, citizens of the United States, both of San Diego, in the county of San Diego and the State of California, have jointly invented certain new and useful Improvements in Folding Pocket-Rules, of which thefollowing is a specification.

This invention relates to certain new and useful improvements in folding pocket-rules of that class designed to be readily held with the arms or sections thereof at diiferent angles to each other to form a square or bevel, as the case may be.

.The novelty of the present invention resides in the peculiar construction and the combination, arrangement, and adaptation of parts, all as more fully hereinafter described, shown in the accompanying drawings, and then particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the letters of reference marked thereon, form apart of this specification, and in which Figure 1 is atop plan view of our improved rule with the arms thereof broken off. Fig. 2 is a section thereof through the line 00 0c of Fig. 1. Figs. 3, 4, 5, 6, and 7 represent in perspective the parts comprising the joint separated. Fig. Sis a diagram of the rule with the arms broken off.

Referring now to the details of the drawings by letter,-A designates one of the brass jaws, and B the other, there being one of such jaws upon opposite sides or faces of the arms A and B of the rule.

In the brass circular neck M, Fig. 2, which formsthe inner and revolving part of the joint and is attached between the brass jaws A to the arm A, a circular groove is cut onesixteenth of an inch in depth, as shown at 10,

Fig. 7, and also in longitudinal section of the circular neck. On either side of this groove is a narrow rim, as shown in Fig. 2.

X, Y, and Z are notches cut in the outer rim to the depth of the groove to receive the ary parts of the joint, as shown at B B in the longitudinal section, Fig. 2. A slot is cut in the circular part of the jaw B, Fig. 5, for the passage of the locking-bolt, which is attached to the slide placed on the jaw, as shown in Fig. 1, the locking-bolt passing downward- B, Fig. 5, and also in section, Fig. 2, the slot' in the washer corresponding to the slot in the jaw, as shown in Figs. 5 and 6. The joint rivet is made of soft steel. A hole is drilled in its center and threaded to receive the slide-screw.

The thumb-slide H is made of steel one-sixteenth of an inch in thickness, and shaped as shown in Fig. 4. In the center of the body of the slide is a round groove, cut to the depth of one-half its depth in the thickness, as shown in section, Fig- 2, and of the diameter shown in Fig. 4. In the bottom of this groove a slot 0 is cut through the slide, and a screw passes into the j oint-rivet to hold the slide in position on the jaw 13, as shown in Fig. 4. The locking-bolt S is attached to the square-shaped nose or projection from the circular part of the slide by means of a rivet in the position shown in thelongitudinal section of the slide, Fig. 2. The nose or projection, being wider than the thickness of the locking-bolt, projects on each side of it and covers the slot in the jaw B, in which the bolt works, thereby preventing dirt from entering the slot and protecting its corners from injury. The slide-screw head is made large enough in diameter to lap over on the bottom of the groove in the slide on either side of the slot 0 far enough to hold the slide in position on the jaw B, SllffiOlGIll] play being left between the underside of the screw-head and the surface of the jaw to allow the slide to be moved freely, the length of the slot permitting the slide to move upon the body of the screw therequired distance to lock and unlock the joint, the locking-bolt moving with the slide H being attached to it, as heretofore dein g into the joint-rivet, as shown in section in Fig. 2. Circular cuts are made in the top of the cap to roughen its surface, in order to prevent the thumb from slipping when moving the slide.'

Fig. 3 represents a rounded brass cap, cut out on the under side and with a rim left around its outer edge, which fits close in the groove in the slide and covers the screw-head, as shown in section in Fig. .3.

The slotted washer shown in Fig. 6 serves as a support for the locking-bolt, it resting its full length in the slot when the joint is interlocked and one-half of its length when the joint is locked. The bolt extending downward to the bottom of the groove in the circular neck and its length corresponding to its width of the washer, it will entirely iill the slot and rest in the groove as though it were a part of the washer. The joint is now unlocked, and the arms of the rule may be opened and closed without interruption, the joint moving as hereinafter described. When the slide ll is moved forward so that thelocking-bolt will restinthe notch in the outer rim of the circular neck M, with one-halt" its length in the slot in the washer and its full length in the corresponding slot in the jaw B, the joint will be locked. The circular neck M, which forms the inner and revolving part of the joint, is restrained by the locking-bolt resting in the notch in its outer rim, which prevents it from turning on the slot-ted washer, which is stationary, being riveted to the jaw B, as heretofore described. The loeking-bolt fitting closely in the slotin the jaw A, in the corresponding slot in the washer, and in the notch in the circular neck M, the arms of the rule will be held firmly at the angle at which they stood when the lockingbolt entered the notch in the outer rim of the circular neck and locked the joint. By placing the circular neck M, which forms the inner and revolving part of the joint, in its place between the jaws B B, which forms the outer and stationary part of the joint, the

slotted washer will fit in the groove to in the neck M, and with the joint-rivet to support and hold the parts together the joint will be Having thus described our invention, what we claim to be new is- 1. The combination, with the arm A and its metallic jaw, and the circular neck carried by said jaw and formed with notches, of the arm B, the jaw on said arm carrying the circular part, notched as shown, and the lockingbolt on said circular part and adapted to move outward from the pivot in locking, substantially as shown and described.

2. The combination, with the arm A and the circular neck secured to said arm and formed with notches and circular groove, of the arm B, carrying jaw B, formed with c.'rcular part, notched as shown, the thumb-slide, and the locking-bolt on said slide, substantially as and for the purpose specified.

The combination, with the arm A and the circular neck carried thereby and formed with circular grooves and notches, ot' the washer having a slot and fitting the circular groove in the neck, and the arm B, having jaw B, the thumb-slide, and the 1oeking-bolt carried by said slide, substantially as and for the purpose specified.

4-. The combination, with the arm, the jaw thereon, and its circular neck, notched, slotted, and grooved as described, of the washer fitted in the groove in the neck and having a slot coincident with the slot in the neck, the arm B, having bifurcated jaw embracing the neck, and notched as shown, the sliding thumb-piece, and the locking-bolt carried by said thumb-piece, and adapted to serve substantially as herein shown and described.

ARTHUR H. DAUCI IY. PETER ROBERTS. \Vitnesses:

J. W. HETHERINGTON, FRANK II. DIXON. 

